Morphological and Optical Properties of Pure and Mg Doped Tin Oxide Thin Films Prepared by Spray Pyrolysis Method
Abdul Rahman Abdul Aziz Sakhta,
Ahmad Hamed Khdro,
Ali Naji Darwisho
Issue:
Volume 3, Issue 2, June 2017
Pages:
19-23
Received:
8 February 2017
Accepted:
1 March 2017
Published:
8 May 2017
Abstract: Pure Tin Oxide (SnO2) and Magnesium (Mg) doped SnO2 thin films have been deposited onto glass substrates by spray pyrolysis technique at the substrate temperature of 450°C. The doping concentration of Mg was varied from 1 to 9 wt% (with 2 wt% step) while all other deposition parameters such as substrate temperature, spray rate, carrier gas pressure and distance between spray nozzle to substrate were kept constant. The surface morphology and optical properties of the deposited thin films have been studied by Scanning Electron Microscopy (SEM) and UV visible spectroscopy. Average optical transmittance in the 400–900 nm range varies from 18.21% to 58.99% with varying Mg concentration in the film. Maximum band gap value of 3.90 eV is obtained for undoped SnO2.
Abstract: Pure Tin Oxide (SnO2) and Magnesium (Mg) doped SnO2 thin films have been deposited onto glass substrates by spray pyrolysis technique at the substrate temperature of 450°C. The doping concentration of Mg was varied from 1 to 9 wt% (with 2 wt% step) while all other deposition parameters such as substrate temperature, spray rate, carrier gas pressure...
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Incorporation of Donar Dopant on BaTiO 3 (BTO) Perovskite Structure
Tasmia Zaman,
Mst. Sharmin Mostari,
Md. Fakhrul Islam
Issue:
Volume 3, Issue 2, June 2017
Pages:
24-29
Received:
10 May 2017
Accepted:
31 May 2017
Published:
4 July 2017
Abstract: The research was done to understand the influence of nano-sized donar dopant incorporation in barium titanate (BTO) structure. Core-shell structures are stated to form while dopants are added directly to BTO. Low diffusivity of ions in solid state results such core-shell structures. Pure BTO was doped with different concentration of niobium oxide (Nb2O5) (0.2, 0.3 and 0.4 mol %). Single stage sintering at 1250°C, 1275°C and 1300°C was initially chosen. Soaking time was varied from 0 to 2 hours. Sintered samples were taken for further characterization. Percent theoretical density (%TD) of the sintered samples was measured. Microstructure of the sintered samples was revealed by Scanning Electron Microscope (SEM). Both temperature and frequency dependent dielectric property was measured using impedance analyzer. X-ray diffraction (XRD) and Differential Thermal Analysis (DTA) was also performed. XRD confirmed the diffusion of Nb5+ ions into the BTO lattice. While impedance analyzer and DTA proved the shifting of Curie temperature (TC) from ~120°C to ~71°C. Enhanced dielectric property was observed by the addition of Nb2O5.
Abstract: The research was done to understand the influence of nano-sized donar dopant incorporation in barium titanate (BTO) structure. Core-shell structures are stated to form while dopants are added directly to BTO. Low diffusivity of ions in solid state results such core-shell structures. Pure BTO was doped with different concentration of niobium oxide (...
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